A new computer program for accurate calculation of acoustic ray paths through a range-varing ocean sound channel has been
written. It is based on creating a model of the speed of sound in the ocean, consistent with input data, that produces the smoothest
possible wavefronts. This scheme eliminates "false caustics" from the wavefront. It may be useful in calculating an approximate
solution to the full wave equation at megameter ranges.

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Funding was provided by the Office of Naval Research under contract N00014-86-C-0358 and the
Office of Naval Technology under contract N00014-90-C-0098.

Ocean bottom seismometer observations at 5000 m depth during the long-range ocean acoustic propagation experiment in the North Pacific in 2004 show robust, coherent, late arrivals that are not readily explained by ocean ...

A study of 400 Hz sound focusing and ducting effects in a packet of curved nonlinear internal waves in shallow water is presented. Sound propagation roughly along the crests of the waves is simulated with a three-dimensional ...

The mantle melting process is fundamental to basalt genesis and crustal accretion at
mid-ocean ridges. It is believed that melts ascend more rapidly than the surrounding
mantle, implying a process similar to fractional ...

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